阅读说明：本技术 一种gis漏气点带压快速封堵方法 (Method for quickly plugging GIS (gas insulated switchgear) air leakage point under pressure ) 是由 刘赛 须晨凯 李晓刚 杨翔宇 李正 蒋伟毅 张远航 陈昊 唐光禹 王俊成 张兆君 于 2021-08-12 设计创作，主要内容包括：本发明公开了一种GIS漏气点带压快速封堵方法,包括：通过SF6检漏确定GIS设备的漏气点个数和位置；对漏气点进行抛光清洁处理,并采用金属修补剂覆盖清洁后的漏气点,形成空腔和出气通道；在出气通道处设置已取出内芯的气门芯,等金属修补剂固化牢固后将内芯置入气门芯中,再次进行SF6检漏；确认空腔上无气体泄漏后,采用金属修补剂覆盖空腔及气门芯,形成金属包；静置24小时以上,等金属修补剂固化牢固后再次进行SF6检漏,如果金属包没有气体泄漏,则完成GIS漏气点封堵。本发明方法可以在GIS设备不停电的情况下,对漏气点进行带压快速封堵,封堵耗时短,施工效率高,封堵成本低,适应范围广。(The invention discloses a method for quickly plugging a GIS air leakage point under pressure, which comprises the following steps: determining the number and the position of air leakage points of the GIS equipment through SF6 leakage detection; polishing and cleaning the air leakage point, and covering the cleaned air leakage point with a metal repairing agent to form a cavity and an air outlet channel; arranging the valve core with the inner core taken out at the air outlet channel, placing the inner core into the valve core after the metal repairing agent is solidified firmly, and performing SF6 leak detection again; after confirming that no gas leaks from the cavity, covering the cavity and the valve core by using a metal repairing agent to form a metal bag; standing for more than 24 hours, performing SF6 leak detection again after the metal repairing agent is solidified firmly, and completing GIS gas leakage point plugging if the metal bag has no gas leakage. The method can rapidly plug the air leakage point under pressure under the condition that the GIS equipment is not powered off, and has the advantages of short plugging time, high construction efficiency, low plugging cost and wide application range.)

1. A GIS air leakage point under-pressure rapid plugging method is characterized by comprising the following steps:

detecting leakage of the low-pressure gas chamber by using a gas leakage detection method of the GIS equipment to obtain the number of leakage points and the positions of the leakage points of the GIS equipment;

determining a corresponding polishing area on a metal shell of the GIS equipment according to the position of each air leakage point, polishing the surface of the polishing area by using a polishing machine, and cleaning the polished surface;

covering the surface of each polished air leakage point by using a metal repairing agent to form a plurality of cavities, and reserving an air outlet channel on each cavity;

arranging the valve core with the inner core taken out at the reserved air outlet channel, and tightly connecting the valve core with the cavity through a metal repairing agent;

after the metal repairing agent in the cavity is firmly cured, placing the inner core into the valve core, and detecting the leakage of the valve core and the cavity by using a GIS equipment gas leakage detection method;

if the valve core and the cavity have no gas leakage, the valve core and the cavity are covered with a metal repairing agent to form a metal bag;

after the metal repairing agent of the metal package is firmly cured, detecting the leakage of the metal package by using a gas leakage detection method of GIS equipment;

and if the metal bag has no gas leakage, the plugging treatment of the gas leakage point of the GIS equipment is completed.

2. The GIS device gas leakage detection method under pressure according to claim 1, characterized in that the GIS device gas leakage detection method comprises a wrapping detection method, a soap water detection method, an infrared imaging method and a laser leakage detection method.

3. The GIS air leakage point under-pressure rapid plugging method according to claim 1, wherein the method for determining the corresponding polishing area on the metal shell of the GIS equipment according to the position of each air leakage point comprises the following steps:

and determining a polishing area corresponding to the air leakage point on a metal shell of the GIS equipment according to a preset radius by taking the air leakage point as a circle center, wherein the value range of the preset radius is 10 cm-15 cm.

4. The GIS leakage point pressurized rapid plugging method according to claim 1, characterized in that the polishing treatment and cleaning treatment method comprises the following steps:

respectively grinding and polishing the surface of the polishing area by using a polishing machine and metallographic abrasive paper with the mesh number of P2400-P7000;

coating a cleaning agent and a surfactant on the polished surface, and cleaning the surface by using a non-woven fabric;

and cleaning the cleaned surface by using the non-fluff paper and the absolute ethyl alcohol.

5. The GIS leakage point pressurized rapid plugging method according to claim 1, wherein the thickness of the cavity is 1 cm-3 cm.

6. The GIS leakage point pressurized rapid plugging method according to claim 1, wherein the thickness of the metal bag is 1 cm-3 cm.

7. The GIS leakage point pressurized rapid plugging method according to claim 1, characterized in that a small-sized grinding wheel polisher is adopted as a polishing machine; the valve core is made of aluminum alloy or steel.

8. The GIS leakage point pressurized rapid plugging method according to claim 1, characterized by further comprising the following steps:

and (3) sequentially and uniformly spraying the anticorrosive primer and the finish paint with the same color as the metal shell of the GIS equipment on the surface of the solidified metal bag to finish the anticorrosive beautification treatment of the sealing surface of the air leakage point.

9. The GIS air leakage point pressurized rapid plugging method according to claim 8, characterized in that the coating thickness of the anti-corrosion primer is not more than 3 times of the design thickness and not more than 450 μm, wherein the design thickness is the manually set coating thickness of the GIS equipment tank body; the thickness of the coating of the anti-corrosion primer is not less than 120 mu m on the surface of the steel structure, and the thickness of the coating of the anti-corrosion primer is not less than 90 mu m on the surface of the aluminum alloy.

10. The GIS leakage point pressurized rapid plugging method according to claim 1, characterized by further comprising the following steps:

if the air leakage exists in the valve core, the cavity or the metal bag, the air leakage point is coated and cured by adopting the metal repairing agent until the air leakage point does not exist in the valve core, the cavity or the metal bag.

Technical Field

The invention relates to a method for quickly plugging a GIS (gas insulated switchgear) air leakage point under pressure, and belongs to the technical field of GIS equipment air leakage maintenance.

Background

The SF6 gas has the advantages of excellent arc extinguishing property, good insulating property and good chemical stability, and is often used as an arc extinguishing and insulating medium in ultrahigh voltage and extra-high voltage electrical equipment. GIS equipment is called gas insulated totally-enclosed combined electrical apparatus, and comprises circuit breaker, isolator, earthing switch, voltage transformer, current transformer, lightning arrester, bus and the like. The devices or components are totally enclosed in an aluminum alloy or steel shell filled with SF6 gas under certain pressure, and are completely isolated from the outside under the condition that the metal shell is sealed well and is not influenced by the external environment. GIS equipment has the advantages of high power supply reliability, small occupied area, short construction period, low noise, low loss, fire prevention, explosion prevention and the like, and is widely accepted by the power industry.

GIS equipment basically does not need to be maintained during normal operation, and only needs to do inspection and routine test work regularly. However, the gas leakage phenomenon of the GIS often occurs, the specific gas leakage reasons are many, the gas leakage reasons comprise various factors such as design construction, manufacturing installation and field operation environment, and the gas leakage reasons of the GIS are commonly found in the problems of housing sand holes, irregular fastening of flange surfaces, aging of sealing rings, unqualified welding seams, shell materials and the like.

Once GIS equipment leaks gas, very easily lead to the inside insulating strength of equipment to descend, moisture infiltration, SF6 low pressure warning scheduling problem, seriously influence GIS equipment operation. At present, the air leakage treatment work aiming at GIS equipment often needs power failure treatment, the power failure time is long, the overhauling difficulty is large, the power failure range is large, the corresponding air leakage overhauling cost is also large, and the air leakage treatment of the GIS equipment always troubles the electric overhauling personnel.

Disclosure of Invention

In order to solve the problems of high difficulty and high cost of gas leakage maintenance of GIS equipment in the prior art, the invention provides a rapid blocking method for a GIS gas leakage point under pressure,

in order to solve the technical problems, the invention adopts the following technical means:

the invention provides a method for quickly plugging a GIS air leakage point under pressure, which comprises the following steps:

detecting leakage of the low-pressure gas chamber by using a gas leakage detection method of the GIS equipment to obtain the number of leakage points and the positions of the leakage points of the GIS equipment;

determining a corresponding polishing area on a metal shell of the GIS equipment according to the position of each air leakage point, polishing the surface of the polishing area by using a polishing machine, and cleaning the polished surface;

covering the surface of each polished air leakage point by using a metal repairing agent to form a plurality of cavities, and reserving an air outlet channel on each cavity;

arranging the valve core with the inner core taken out at the reserved air outlet channel, and tightly connecting the valve core with the cavity through a metal repairing agent;

after the metal repairing agent in the cavity is firmly cured, placing the inner core into the valve core, and detecting the leakage of the valve core and the cavity by using a GIS equipment gas leakage detection method;

if the valve core and the cavity have no gas leakage, the valve core and the cavity are covered with a metal repairing agent to form a metal bag;

after the metal repairing agent of the metal package is firmly cured, detecting the leakage of the metal package by using a gas leakage detection method of GIS equipment;

and if the metal bag has no gas leakage, the plugging treatment of the gas leakage point of the GIS equipment is completed.

Further, the GIS equipment gas leakage detection method comprises a wrapping detection method, a soap water detection method, an infrared imaging method and a laser leakage detection method.

Further, the method for determining the corresponding polishing area on the metal shell of the GIS device according to the position of each air leakage point comprises the following steps:

and determining a polishing area corresponding to the air leakage point on a metal shell of the GIS equipment according to a preset radius by taking the air leakage point as a circle center, wherein the value range of the preset radius is 10 cm-15 cm.

Further, the method of polishing and cleaning process comprises the steps of:

respectively grinding and polishing the surface of the polishing area by using a polishing machine and metallographic abrasive paper with the mesh number of P2400-P7000;

coating a cleaning agent and a surfactant on the polished surface, and cleaning the surface by using a non-woven fabric;

and cleaning the cleaned surface by using the non-fluff paper and the absolute ethyl alcohol.

Further, the thickness of the cavity is 1 cm-3 cm.

Further, the thickness of the metal bag is 1 cm-3 cm.

Further, the polishing machine adopts a small-sized grinding wheel polishing machine; the valve core is made of aluminum alloy or steel.

Further, the method comprises the following steps:

and (3) sequentially and uniformly spraying the anticorrosive primer and the finish paint with the same color as the metal shell of the GIS equipment on the surface of the solidified metal bag to finish the anticorrosive beautification treatment of the sealing surface of the air leakage point.

Further, the coating thickness of the anti-corrosion primer is not more than 3 times of the design thickness and not more than 450 micrometers, wherein the design thickness is the manually set coating thickness of the GIS equipment tank body; the thickness of the coating of the anti-corrosion primer is not less than 120 mu m on the surface of the steel structure, and the thickness of the coating of the anti-corrosion primer is not less than 90 mu m on the surface of the aluminum alloy.

Further, the method comprises the following steps:

if the air leakage exists in the valve core, the cavity or the metal bag, the air leakage point is coated and cured by adopting the metal repairing agent until the air leakage point does not exist in the valve core, the cavity or the metal bag.

The following advantages can be obtained by adopting the technical means:

the invention provides a GIS (gas insulated switchgear) air leakage point under-pressure rapid plugging method, which is characterized in that after a GIS equipment air leakage point is determined, a 'dredging and plugging combination method' is adopted to perform plugging and leakage detection operations on an area where the air leakage point is located, so that plugging work can be performed under the condition that the GIS equipment is not powered off, and the pressure of an air chamber where the GIS equipment air leakage point is located does not need to be reduced, thereby realizing the GIS air leakage point under-pressure rapid plugging effect. The method at least comprises 2 times of plugging, the total plugging time is generally 24-48 hours (including the standing time of the metal healant shell), compared with the existing plugging operation, the time consumption is short, the construction efficiency is high, the plugging effect is good, the live and pressurized operation can be realized, and the overhaul cost is low. The method can achieve the purpose of quickly stopping leakage, ensure no SF6 gas leakage, recover the normal operation state of GIS equipment in a short time and ensure the safety, stability and reliability of a power grid.

The method is simple and clear in operation and easy to master, the adopted leakage stoppage tools are common and easy to obtain, the method has the advantages of low cost and convenience in use, the leakage stoppage tools can quickly stop leakage points at various positions such as a metal shell, a flange butt joint surface and a welding seam under pressure, and the application range is wide.

Drawings

FIG. 1 is a flow chart of steps of a GIS air leakage point pressurized rapid plugging method of the invention;

FIG. 2 is a schematic view of the position of the cavity and the valve core in an embodiment of the present invention;

FIG. 3 is a schematic illustration of a valve core plugging process according to an embodiment of the present invention;

FIG. 4 is a schematic view of a valve core cover screwed on in an embodiment of the present invention;

FIG. 5 is a schematic view of a metal pack in an embodiment of the invention;

in the figure, 1 is a cavity, 2 is a valve core, 3 is an inner core, 4 is a valve core cover, and 5 is a metal bag.

Detailed Description

The technical scheme of the invention is further explained by combining the accompanying drawings as follows:

the invention provides a GIS air leakage point under-pressure rapid plugging method, which specifically comprises the following steps as shown in figure 1:

s1, detecting the leakage of the low-pressure air chamber by using a GIS equipment gas leakage detection method to obtain the number of leakage points and the positions of the leakage points of the GIS equipment; the GIS equipment gas leakage detection method comprises a wrapping detection method, a soap water detection method, an infrared imaging method and a laser leakage detection method.

And S2, determining a corresponding polishing area on the metal shell of the GIS device according to the position of each air leakage point, polishing the surface of the polishing area by using a polishing machine, and cleaning the polished surface.

And determining a polishing area corresponding to the air leakage point on a metal shell of the GIS equipment according to a preset radius by taking the air leakage point as a circle center, wherein the value range of the preset radius is 10 cm-15 cm.

In the method, the polishing machine can adopt a small grinding wheel polishing machine which is convenient and practical for field work, the cleaning set comprises absolute ethyl alcohol, a cleaning agent, a surfactant, non-woven fabrics and hairless paper, and the processes of polishing treatment and cleaning treatment are as follows:

and S21, respectively grinding and polishing the surfaces of the polished areas by using a polishing machine and metallographic abrasive paper with meshes of P2400-P7000.

And S22, coating a cleaning agent and a surfactant on the polished surface, and finely cleaning the polished surface by using a non-woven fabric.

And S23, cleaning the cleaned surface by using the non-woven paper and the absolute ethyl alcohol.

S3, covering the surface of each polished air leakage point by using a metal repairing agent to form a plurality of cavities, and reserving an air outlet channel on each cavity, wherein the thickness of each cavity is 1 cm-3 cm, and the diameter of each air outlet channel can be controlled according to the valve inside.

The metal repairing agent can be a W-2813 aluminum repairing agent or an American common metal repairing glue stick, is common and easy to purchase, and is convenient to obtain and use. When the metal repairing agent is used, firstly, the colloid in the plastic pipe is taken out, two materials with different colors, namely the inner core and the outer skin of the colloid, are uniformly mixed for about 3-5 minutes, then the mixed colloid is covered on the surface after cleaning and polishing, and a cavity with a proper size is formed above an air leakage point by kneading the colloid.

And S4, arranging the valve core with the inner core taken out at the reserved air outlet channel, and tightly connecting the valve core with the cavity through a metal repairing agent.

In the embodiment of the invention, the valve core is made of aluminum alloy or steel, and can be used for automobile valves or bicycle valves, and is common and easy to obtain. And taking out the inner core of the valve core, placing the inner core into the reserved air outlet channel, and reinforcing and repairing the contact surface of the valve core and the air outlet channel by using a metal repairing agent, wherein the valve core forms an SF6 gas exhaust channel, so that the leaked SF6 gas is only exhausted from the valve core channel, and a new air leakage point is prevented from being generated by the metal repairing agent.

And S5, after the metal repairing agent in the cavity is firmly cured, placing the inner core into the valve core, and detecting the leakage of the valve core and the cavity by using a GIS (gas insulated switchgear) equipment gas leakage detection method.

After the step S4 is completed, the metal repairing agent in the cavity can be firmly cured by maintaining the state for more than 24 hours; the inner core is arranged in the valve core, the valve core cover is screwed on, and then SF6 leakage detection is carried out on the valve core and the cavity to confirm whether the cavity and the valve core have air leakage or not.

And S6, if the valve core and the cavity have no gas leakage, covering the surfaces of the valve core and the cavity with a metal repairing agent to form a metal bag, and further enhancing the plugging effect of a gas leakage point, wherein the thickness of the metal bag is 1 cm-3 cm. If the air leakage exists between the valve core and the cavity, the air leakage point is coated and cured by using the metal repairing agent until the air leakage point does not exist on the surfaces of the valve core and the cavity.

And S7, detecting the leakage of the metal bag by using a GIS equipment gas leakage detection method after the metal repairing agent of the metal bag is firmly cured.

After completion of step S6, the metal healant for metal wrapping can be firmly cured by maintaining this state for 24 hours or more.

S8, if the metal bag has no gas leakage, the plugging treatment of the gas leakage point of the GIS equipment is finished, and in order to further improve the plugging effect, the invention evenly sprays the anticorrosion primer and the finish paint with the same color as the metal shell of the GIS equipment on the surface of the solidified metal bag in sequence, thereby finishing the anticorrosion beautification treatment of the plugging surface of the gas leakage point.

Because the metal bag belongs to the second layer of the leaking stoppage layer, the metal bag does not have a leaking point under the condition that the first layer (the cavity and the valve core) does not have the leaking point, if the metal bag still has the gas leakage, the metal repairing agent is adopted for coating and curing until no gas leakage exists, and the final leaking stoppage work can be finished.

The coating thickness of the anti-corrosion primer needs to be designed according to design requirements, specifically: the coating thickness of the anti-corrosion primer is not more than 3 times of the design thickness and not more than 450 micrometers, wherein the design thickness is the coating thickness of the GIS equipment tank body which is set manually; the thickness of the coating of the anti-corrosion primer is not less than 120 mu m on the surface of the steel structure, and the thickness of the coating of the anti-corrosion primer is not less than 90 mu m on the surface of the aluminum alloy.

In the method, SF6 leak detection is carried out for 3 times, the number of SF6 gas leakage points is determined and positioned for the 1 st time, whether SF6 gas leakage exists after a layer 1 metal repairing agent (cavity) is placed in an inner core of a valve core is determined for the 2 nd time, whether SF6 gas leakage exists in a layer 2 metal repairing agent (metal bag) is determined for the 3 rd time, the gas leakage point plugging effect can be better checked through multiple SF6 leak detections, and the GIS gas leakage points are quickly plugged under pressure.

In order to verify the effect of the method of the invention, the following examples are given:

carry out the quick shutoff of leaking gas point area pressure to certain air chamber of certain 500kV GIS equipment, as shown in fig. 2~5, specifically operate as follows:

(1) and (3) SF6 leak detection: and (3) comprehensively applying a soap water detection method and an infrared imaging method to detect the leakage of the GIS air chamber corresponding to the on-site low-pressure alarm. Scanning an SF6 air chamber by an SF6 infrared leak detector, determining the approximate range of an air leakage point, placing high-concentration soapy water on a metal shell in the approximate range by adopting a soapy water detection method, and accurately positioning the air leakage point by observing the bubbling phenomenon to obtain the number and the position of the air leakage point of the GIS equipment.

(2) Polishing and cleaning: determining a corresponding polishing area (10-15 cm away from the air leakage point) on a metal shell of the GIS equipment according to the position of each air leakage point, and in order to improve the polishing effect, firstly, roughly polishing the surface of the polishing area by using a small grinding wheel polishing machine, and then, carrying out high-precision grinding and polishing by combining metallographic abrasive paper with the mesh number of P2400-P7000. And polishing the surface of the polishing area by using a polishing machine, and cleaning the polished surface.

(3) Covering with a metal repairing agent: taking out colloid in a plastic tube of the W-2813 aluminum repairing agent as a metal repairing agent, uniformly mixing two materials with different colors, namely an inner core and an outer skin of the colloid, wherein the time is about 3-5 minutes, covering the mixed colloid on the surface after cleaning and polishing, kneading by hands to form a cavity 1 with a proper size above an air leakage point, and reserving an air outlet channel at the upper part of the cavity formed by the metal repairing agent, wherein the diameter of the air outlet channel is consistent with the outer diameter of a valve core 2.

(4) Setting a valve core: the inner tube-free air valve for the automobile is used as an air valve core and is made of alloy and high-quality rubber. The inner core 3 of the valve core was removed and the valve core was placed in the initial channel and reinforced with a W-2813 aluminum repair agent at the contact surface, where the valve core formed the exhaust channel of SF 6.

(5) Standing, plugging with a metal repairing agent and detecting leakage with SF 6: the GIS equipment provided with the cavity and the valve core is placed still for more than 24 hours until the metal repairing agent in the cavity is firmly cured, SF6 gas can be discharged through the valve core during the standing period, and the leakage amount of SF6 gas is generally within a controllable range due to the fact that the size of a gas outlet of the valve core is small. And (3) placing the inner core into the valve core, screwing the valve core cover 4, and performing leak detection on the valve core and the cavity by adopting a soapy water detection method and an infrared imaging method.

(6) Arranging a metal bag 5: if the valve core and the cavity have no gas leakage, indicating that the leakage point is basically sealed, SF6 gas does not leak out from the leakage point. In order to further improve the plugging effect, the surface of the valve core and the cavity is covered by adopting a W-2813 aluminum repairing agent, and the surface of the valve core and the cavity is covered by a layer of repairing agent to form a metal bag.

(7) Standing and SF6 leakage detection: and standing the GIS equipment provided with the metal bag for more than 24 hours until the metal repairing agent of the metal bag is firmly cured, and detecting the leakage of the metal bag by using a soap water detection method and an infrared imaging method again to determine whether SF6 gas leaks from the metal bag.

(8) Anticorrosion and beautification: when the metal bag has no gas leakage, the surface of the metal bag is coated with the anticorrosive primer special for GIS equipment, the coating thickness of the anticorrosive primer is 150 μm, and the coating thickness and the adhesive force can meet the requirements. And finally, coating a top coat with the color similar to that of the metal shell of the GIS equipment after blending on the surface of the primer, and finishing the plugging treatment of the gas leakage point of the GIS equipment.

Compared with the prior art, the method can perform the leakage stopping work under the condition that the GIS equipment is not powered off, and the air chamber where the GIS equipment air leakage point is located does not need to be depressurized, so that the GIS air leakage point under-pressure rapid blocking effect is realized. The plugging method is simple and easy to learn, the adopted plugging tools are common and easy to obtain, the time consumption is short, the construction efficiency is high, the plugging effect is good, the overhaul cost is low, and the use is convenient. The method can rapidly plug the air leakage points at various positions such as the metal shell, the flange butt joint surface, the welding seam and the like under pressure, has wide application range, can recover the normal operation state of the GIS equipment in a short time, and ensures the safety, stability and reliability of the power grid.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.